/* ============================================================================
   PROFESSIONAL RESPONSIVE DESIGN - Mobile-First Approach
   ============================================================================ */

/* Base, Mobile-First Optimizations (320px+) */
:root {
    --transition-speed: 0.3s ease-in-out;
    --breakpoint-sm: 576px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 992px;
    --breakpoint-xl: 1200px;
    --breakpoint-2xl: 1400px;
}

html, body {
    overflow-x: hidden !important;
    scroll-behavior: smooth;
}

* {
    box-sizing: border-box;
}

/* Typography - Mobile First */
html {
    font-size: 14px;
}

body {
    font-size: 1rem;
    line-height: 1.6;
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

/* Improved Mobile Padding/Margins */
.container {
    padding-left: 1rem;
    padding-right: 1rem;
}

.container-fluid {
    padding-left: 1rem;
    padding-right: 1rem;
}

/* Section Spacing */
section {
    padding: 1.5rem 0;
}

/* Images Responsive */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

picture,
figure {
    max-width: 100%;
}

/* Tables Mobile Friendly */
table {
    width: 100%;
    margin-bottom: 1.5rem;
    border-collapse: collapse;
}

@media (max-width: 767px) {
    table {
        font-size: 0.875rem;
    }

    table thead {
        display: none;
    }

    table tbody, table tr, table td {
        display: block;
        width: 100%;
    }

    table tr {
        margin-bottom: 1rem;
        border: 1px solid #ddd;
        border-radius: 0.375rem;
        padding: 0.5rem;
    }

    table td {
        padding: 0.5rem 0;
        text-align: left;
        position: relative;
        padding-left: 50%;
    }

    table td:before {
        content: attr(data-label);
        position: absolute;
        left: 0.5rem;
        font-weight: 600;
        width: 45%;
        white-space: nowrap;
    }
}

/* Forms Mobile-Friendly */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="tel"],
input[type="url"],
input[type="number"],
textarea,
select {
    width: 100%;
    padding: 0.75rem;
    margin-bottom: 1rem;
    border: 1px solid #ccc;
    border-radius: 0.375rem;
    font-size: 1rem;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="tel"],
input[type="url"],
input[type="number"],
textarea,
select {
    touch-action: manipulation;
}

/* Prevent font zoom on iOS input focus */
@media (max-width: 575px) {
    input[type="text"],
    input[type="email"],
    input[type="password"],
    input[type="search"],
    input[type="tel"],
    input[type="url"],
    input[type="number"],
    textarea,
    select {
        font-size: 16px; /* iOS - prevents zoom on focus */
    }
}

textarea {
    resize: vertical;
    min-height: 100px;
}

/* Buttons */
button,
a.btn,
.button,
input[type="submit"],
input[type="button"] {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    margin-bottom: 0.5rem;
    border: none;
    border-radius: 0.375rem;
    cursor: pointer;
    font-size: 1rem;
    text-decoration: none;
    transition: all var(--transition-speed);
    min-height: 44px;
    min-width: 44px; /* Mobile touch target */
    touch-action: manipulation;
}

button:active,
a.btn:active,
input[type="submit"]:active {
    transform: translateY(1px);
}

/* Navigation Mobile Menu */
.navbar {
    width: 100%;
    padding: 0.5rem 1rem;
}

.navbar-nav {
    flex-direction: column;
    gap: 0.5rem;
}

.nav-link {
    padding: 0.75rem 0.5rem;
}

@media (min-width: 768px) {
    .navbar {
        padding: 1rem 2rem;
    }

    .navbar-nav {
        flex-direction: row;
        gap: 1rem;
    }

    .nav-link {
        padding: 0.5rem 1rem;
    }
}

/* Flexbox Utilities */
.flex-column-mobile {
    flex-direction: column;
}

@media (min-width: 768px) {
    .flex-column-mobile {
        flex-direction: row;
    }
}

.flex-gap-mobile {
    gap: 0.5rem;
}

@media (min-width: 768px) {
    .flex-gap-mobile {
        gap: 1.5rem;
    }
}

/* Cards Mobile-Friendly */
.card {
    margin-bottom: 1.5rem;
    border-radius: 0.5rem;
    overflow: hidden;
}

.card-body {
    padding: 1rem;
}

@media (min-width: 768px) {
    .card-body {
        padding: 1.5rem;
    }
}

/* Grid Responsive */
.row {
    margin-left: -0.5rem;
    margin-right: -0.5rem;
}

.col,
.col-sm-1, .col-sm-2, .col-sm-3, .col-sm-4, .col-sm-5, .col-sm-6,
.col-md-1, .col-md-2, .col-md-3, .col-md-4, .col-md-5, .col-md-6,
.col-lg-1, .col-lg-2, .col-lg-3, .col-lg-4, .col-lg-5, .col-lg-6 {
    padding-left: 0.5rem;
    padding-right: 0.5rem;
}

/* Spacing - Mobile First */
.mb-mobile-2 { margin-bottom: 0.5rem; }
.mt-mobile-2 { margin-top: 0.5rem; }
.p-mobile-2 { padding: 0.5rem; }
.px-mobile-2 { padding-left: 0.5rem; padding-right: 0.5rem; }

@media (min-width: 768px) {
    .mb-mobile-2 { margin-bottom: initial; }
    .mt-mobile-2 { margin-top: initial; }
    .p-mobile-2 { padding: initial; }
    .px-mobile-2 { padding: initial; }
}

/* Hide Elements Responsively */
.d-none-mobile {
    display: none !important;
}

.d-none-tablet {
    display: none !important;
}

.d-none-desktop {
    display: none !important;
}

@media (min-width: 576px) {
    .d-none-mobile {
        display: block !important;
    }
}

@media (min-width: 768px) {
    .d-none-tablet {
        display: block !important;
    }
}

@media (min-width: 992px) {
    .d-none-desktop {
        display: block !important;
    }
}

/* Tablet Optimizations (768px+) */
@media (min-width: 768px) {
    html {
        font-size: 15px;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }

    section {
        padding: 2rem 0;
    }

    .container {
        padding-left: 2rem;
        padding-right: 2rem;
    }
}

/* Desktop Optimizations (992px+) */
@media (min-width: 992px) {
    html {
        font-size: 16px;
    }

    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.75rem; }

    section {
        padding: 3rem 0;
    }

    .container {
        padding-left: 0;
        padding-right: 0;
    }
}

/* Large Desktop (1200px+) */
@media (min-width: 1200px) {
    h1 { font-size: 3rem; }
    h2 { font-size: 2.25rem; }
    h3 { font-size: 1.875rem; }

    section {
        padding: 4rem 0;
    }
}

/* Utility Classes for Common Responsive Patterns */

/* Text utilities */
@media (max-width: 767px) {
    .text-md-center { text-align: left; }
    .text-md-right { text-align: left; }
}

@media (min-width: 768px) {
    .text-md-center { text-align: center; }
    .text-md-right { text-align: right; }
}

/* Display utilities - Show/Hide based on device */
@media (max-width: 767px) {
    .show-mobile { display: block !important; }
    .hide-mobile { display: none !important; }
}

@media (min-width: 768px) and (max-width: 991px) {
    .show-tablet { display: block !important; }
    .hide-tablet { display: none !important; }
}

@media (min-width: 992px) {
    .show-desktop { display: block !important; }
    .hide-desktop { display: none !important; }
}

/* Landscape Mobile */
@media (max-height: 600px) and (orientation: landscape) {
    section {
        padding: 1rem 0;
    }

    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.25rem; }
}

/* Touch-Friendly Spacing */
.touch-target {
    min-width: 48px;
    min-height: 48px;
    padding: 12px 16px;
}

/* Performance - Disable animations on slow devices */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}

/* Accessibility - Focus states */
button:focus,
a:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 2px solid #007bff;
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    body {
        font-size: 12pt;
    }

    nav,
    footer,
    .no-print,
    .btn {
        display: none !important;
    }

    a {
        text-decoration: underline;
    }
}